You can export various types of inventory data to Microsoft Excel by simply pressing the "Export" button in the command bar, if it is visible.
The Excel Export Button
This function will create a very basic table with the data that you have selected and that are visible in OTbase Inventory.
OTbase XLSX Writer
If you need more fancy and comprehensive spreadsheets, check out the OTbase XLSX Writer that produces multi-worksheet Excel files, including charts. OTbase XLSX Writer is a standalone add-on to OTbase Inventory.